Lift Check Valve
Lift Check Valve
(OP)
Lift Check Valve spring loaded, consider during hydro test crack open pressure was 1 bar, will this pressure change with Air, Stem or other fluids
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RE: Lift Check Valve
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RE: Lift Check Valve
Why does a lift check valve[Metal seated] leak during air seat test when compared to hydro seat. Is there any relation between seat leak & crack open pressure
RE: Lift Check Valve
Pressure is pressure. If I build up enough overpressure upstream of a lift check to overcome spring pressure and the force of the downstream pressure, then the valve will open regardless of the upstream fluid. That is cracking pressure, fluid independent. On the other hand, the check valve staying open is a function of dynamic pressure (since flowing static dP over the distance of the valve seat is infinitesimal). Dynamic pressure has a density component, so fluid species matters in check valve chatter.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Lift Check Valve
In a test the volume capacity of the test fluid can be limited. So to get to 1 bar with liquid it only takes a minute amount of liquid ( literally a few drops) for the pressure to go below 1 bar and the valve reseats. Air is much more compressible so the nuber of bubbles will be much higher.m
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RE: Lift Check Valve
How to pass API598 air seat & achieve 1 bar crack open.